Lock.



FA BLANKAVAG.

LOCK.

APPucATloN FILED 1uLY22. 1915.

`Patented Apr. 3,1917.

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F. BLANK/WAS.

LOCK.

APPLLcATmN FILED 1uLY22, i915.

Patented Apr. 3, 1917.

2 SHEETS-SHEET 2.

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FRANK BLANKAVAG, OF PRINCETON, WISCONSIN.

LOCK.

Application ilefl July 22, 1915.

To @ZZ whom t may concern:

Be it known that I, FRANK BLANKAVAG, a citizen of the United States,residing at Princeton, in the county of Green Lake and State ofWisconsin, have invented certain new and useful Improvements in Locks;and I do declare the following to be a full, clear, and eXactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

Myinvention relates to useful improvements in locks and latches, andmore particularly to the former, the object of the invention being toprovide a lock having in addition to its main key actuated locking bolt,a supplemental bolt which is normally held retracted against the tensionof a spring, but which is immediately projected upon attemptedretraction of the main bolt.

With the above object in view, the invention resides in certain novelfeatures of construction and in unique combinations of parts to behereinafter fully described and claimed, the descriptive matter beingsupplemented by the accompanying drawings which constitute a part ofthis application and in which:

Figure 1 is an elevation, on a small scale, showing the inner side of aportion of a door equipped with the improved lock;

Fig. 2 is a similar view on an enlarged scale with the cover plate ofthe lock removed and illustrating the lock keeper in vertical section;

Fig. 3 is a similar view showing a d1fferent position of parts;

Fig. 4 is a detail vertical section taken on the plane indicated by theline 4-4 of Fig. 1; r l

Fig. 5 is a perspective view of the supplemental locking bolt;

Fig. 6 is a similar view of the tumbler thereof' Fig. 7 is an additionalperspective showing the tumbler releasing trigger; and,

Fig. 8 is a disassembled perspective view i of the keeper.

In describing the invention, I shall refer to the drawings by similarreference characters placed on corresponding parts throughout theseveral views, the numeral 1 desig nating broadly a casing which ispreferably though not'necessarily, of rectangular formation having anappropriate cover plate 2, the lower edge of the casing being providedSpecicaton of Letters Patent.

Patented Apr. 3, 1917.

Serial No. 41,302.

with a notch 3 through which an appropriate shiftable stop 4 may beprojected into the casing for a purpose to be set forth, such stop beingcarried by a stem 5 which projects through a slot 6 in the cover plate 2and which is provided with an appropriate operating button 7 and with aspring 8 interposed between said button and the cover plate and havingoffset ends adapted to spring into `grooves 9 in the outer side of saidplate, when the stop is shifted either to active or inactive position.

Slidably mounted in the upper end of the casing is a spring projectedcatch 10 which may be of any preferred formation capable of beingretracted by partial rotation of the usual knob actuated shaft 11, whileiminediately below the catch 10, is a key projected and retractedlocking bolt, this bolt being normally held against movement by a commontype of spring pressed tumbler 13, but being operable in eitherdirection by a key 14 which is insertible through peculiarly shaped keyholes 15 in opposite sides of the casing. These key holes are here shownas elongated and having their opposite ends enlarged as disclosed at 16and 16a for the reception of the usual cylindrical projection on thekey.

The enlarged end 16 of either key hole receives the projection on thekey when the bolt 12 is to be projected or retracted, whereas the end16l receives said projection when va supplemental bolt 17 is to beretracted.

The bolt 17 is disposed immediately above the notched lower side of thecasing 1 and is provided with a pair of stop shoulders 18 on its upperside which receive therein a stop 19 which is extended laterally from asubstantially right angular tumbler 20, the latter being pivoted at oneend to a stud 21 spaced upwardly from the bolt, while its opposite endis provided with a laterally exending shoulder 22, the intermediateportion of the tumbler being positioned behind the aforesaid bolt withits.. stop 19 disposed between the stop shoulders 1S, this lowerniostposition of the tumbler being effective to retain the bolt 17 retractedagainst a coiled spring 23 which is interposed between the rear side ofthe casing and a shoulder 24 depending from the bolt, by an appropriateleaf spring 25 which bears normally against the aforesaid stop.

Pivoted at one end upon a stud 26 is a trigger 27 whose other end isforked as disclosed at 28 and is positioned in the path of the key 14when the latter is used to retract Y the main locking bolt 12, theintermediate portion of the aforesaid trigger being disposed in contactwith the -shoulder 22.

By this positioning of parts, when the key 14 is inserted into the upperend 16 of one of the key holes and turned in a direction to retract themain locking bolt 12, the forked end of the trigger will be encounteredby the wing of the key which is fashioned similarly to said forged end.The result is that the trigger 27V is raised, thu-s so rocking theangular tumbler as to retract its stop 19 from contact with the stopshoulders 13, whereupon the coiled spring 23 immediately projects thesupplemental bolt 17, which latter is therefore effective before themain bolt 12 is withdrawn.

When the supplemental bolt isto be retracted, the key is inserted withits projection in the lower end 16 of one of the key holes 15, whereuponits wing may be brought into contact with a shoulder 29 on said boltthus readily allowing the same tobe withdrawn. Y If desired, additionaltumbler means may be provided for retaining the supplemental bolt inprojected position, but it is not thought necessary to encumber thePresent application with illustration of such means, particularly Vinview of the fact that an alarm is operated by projection of the bolt inquestion, thus giving warning to the occupants of the building thatattempts are being made to enter the same, it being thereforeunessential to provide the tumbler means in question, since by the timethe supplemental bolt is retracted and the door is open, the occupantsof the building will undoubtedly be aroused and prepared to resistentrance.

During the periods when use of the supplemental bolt-,.17 isunnecessary,however, the shiftable stop 4 is projected in advance of the shoulder24, thus preventing projection of said bolt regardless of motionimparted to the trigger 27 by the movement of the key inserted toactuate the bolt 12.

Secured by screws or the like 30 to the inner side of the door frame, isan upright face plate 31 in rear of which a housing 32 is positioned,said housing being L-shaped in transverse section and having rectangularends 33 one of whose free edges abuts the rear face of the aforesaid`face plate, stops 34 being carried Vby said plate4 in contact with theends 33, whereby to limit vertical movement of the housing, horizontalmovement of thelatter being resisted in one direction by said stops, andin other directions by the walls of the cavity in which the housing isinset.

By the construction just described, the keeper is provided with one openside disposed toward the door and adapted to re ceive therein the endsof the catch 10, the

kbolt 12, or the supplemental bolt 17 when these parts are projected.

P ivotod within the housing at one end, is a switch arm 35 which isprovided at its other end with a lateral extension 36 adapted to bepresented to the contacts 37 when the supplemental bolt 17 is projected,said arm being normally held by the friction of its pivot, in theposition shown in Fig. 2. By this means, the circuit of an electricalarm may be completed, since the pivoted end of the switch arm 35 isconnected by the wire 38 with a binding post 39 on the inner side of theface plate 31, while the contacts 37 are connected by a wire 38 with anadditional binding post 39 positioned adjacent the post 39. Thus it willbe evident that by appropriate wiring either a visual or audible alarmmay be operated simultaneously with projection of the supplementallocking bolt, or in other words upon an attempt to unlock the door.

lVhen the use of the circuit closing device is not needed, a button 40adjacent the inner side of the face plate 31 may be rotated thereby sodisposing an arm 41 in rear of the switch arm 35 as to preventdisposition of the latter to use.

Y The switch arm 35 may be constructed in any one of a number of types,but it is preferably formed of one Hat strip of copper or otherappropriate metal, the pivoted end of the strip being oifset at 35,while between its ends said strip is bent laterally at 35h, and is thencontinued longitudinally and bent laterally in the opposite direction atits free end to provide the extension 36. Since the opposite endportions of the strip forming the arm 35 must lie in planes disposed atright angles to each other, the portion of said strip between the offsetportion 35 and the lateral bend 35 is given a quarter twist as shown at35C. By constructing the arm in the manner above set forth, the same maybe easily and cheaply manufactured, yet will be eiiicient and durable inoperation, the portion of said arm continuing from the bend 351,becoming advantageous to receive therein the arm 41.

From the foregoing description, taken in connection with theaccompanying drawings, it will be evident that although I have providedcomparatively simple and inexpensive construction for the attainment ofthe results desired, the invention will be efcient, durable, andreliable, these being salient features in any article of manufacture.

I claim:

1. A lock comprising a key actuated locking bolt, a supplementalnormally retracted spring projected locking bolt having a stop, anangular tumbler pivoted independently of the bolt and having a stopnormally conkey actuated trigger pivoted independently.

of the tumbler and having one end disposed in the path of a false keywhich may be used in an attempt to retract the main bolt, the shoulderof the tumbler being disposed in the path in which the trigger movesWhen actuated by such a key.

2. A lock comprising a casing, a main key actuated locking bolt slidabletherein, a supplemental normally retracted spring projected locking boltalso mounted slidably in the casing parallel with the other bolt, ant.shaped tumbler pivoted at one of its ends to the casing between thebolts and having its other end directed laterally to form a shoulder, astop projecting laterally from said L-shaped tumbler at approximatelythe angle thereof, another stop on the supplemental bolt for coperationwith the first named stop to retain this bolt normally retractedagainst'the tension of its spring, a one-piece trigger pivoted at oneend toi the casing between the angularly related ends of the tumbler,said trigger extending across 4the end of' said tumbler equipped withthe shoulder and having its free end disposed in the path of a false keywhich may be used in an attempt to retract the main bolt, said shoulderbeing disposed on the path upon which said trigger moves When actuatedby such a key.

ln testimony whereof I have hereunto set my hand in presence of tivosubscribing Witnesses.

FRANK BLANKAVAG.

Witnesses:

FRED BRUvoGEL, JAMES L. KELLEY.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

